JavaScript

Get wp:Greasemonkey (here) so that you can have your browser be even more useful. You might even want to use [Super Greasemonkey] if you like using the awesome JQuery library. I'm hoping that Super Greasemonkey makes it into the official version, and that you can specify in your script which JQuery library to run (like Google's hosted JQuery scripts) making it easier to keep compatibility with the JQuery API version and also avoiding the need to bundle JQuery.

• MediaWiki/js talks about using JavaScript in MediaWiki
• User Scripts are JavaScripts that you insert into your web browser such as Greasemonkey scripts. Userscripts.org is the open source repository of Grease Monkey scripts.

Dan Phiffer wrote the following Greasemonkey script that turns any MediaWiki article into a slide presentation. I changed the presentation a bit.

// ==UserScript==
// @name           Wikipedia Presentation
// @namespace      http://phiffer.org/
// @description    Turn a Wikipedia article into a presentation
// ==/UserScript==

var wikipedia_presentation = {
setup: function() {

this.sections = [];
this.pos = 0;

var body = document.getElementsByTagName('body')[0];
this.orig_markup = body.innerHTML;
var markup = body.innerHTML;
var start = 0;
var end = markup.indexOf('<span class="editsection"');
while (end != -1) {
start = markup.indexOf('</span>', end);
end = markup.indexOf('<span class="editsection"', start);
if (end == -1) {
end = markup.indexOf('<div class="printfooter">', start);
this.sections.push(markup.substr(start, end - start));
end = -1;
}
this.sections.push(markup.substr(start, end - start));
}
if (this.sections.length > 0) {
var div = document.getElementById('bodyContent');
var link = div.insertBefore(document.createElement('a'), div.firstChild);
link.innerHTML = 'Start presentation';
link.setAttribute('href', '#presentation');
link.addEventListener('click', this.start, false);
}
},

start: function() {
var body = document.getElementsByTagName('body')[0];
body.innerHTML = '';
body.style.textAlign = 'center';

var prev = body.appendChild(document.createElement('a'));
prev.innerHTML = '&larr; Prev';
prev.setAttribute('href', '#prev');
prev.style.font = '11px verdana, sans-serif';
prev.addEventListener('click', function() {
wikipedia_presentation.prev();
}, false);

body.appendChild(document.createTextNode(' / '));

var stop = body.appendChild(document.createElement('a'));
stop.innerHTML = 'Exit';
stop.setAttribute('href', '#exit');
stop.style.font = '11px verdana, sans-serif';
stop.addEventListener('click', function() {
wikipedia_presentation.stop();
}, false);

body.appendChild(document.createTextNode(' / '));

var next = body.appendChild(document.createElement('a'));
next.innerHTML = 'Next &rarr;';
next.setAttribute('href', '#next');
next.style.font = '11px verdana, sans-serif';
next.addEventListener('click', function() {
wikipedia_presentation.next();
}, false);

var slide = body.appendChild(document.createElement('div'));
slide.setAttribute('id', 'wikipedia_presentation');
slide.style.width = '780px';
slide.style.margin = '10px 10px 10px 20px';
slide.style.textAlign = 'left';
slide.style.font = '2em verdana, sans-serif';

slide.innerHTML = wikipedia_presentation.sections[0];
var items = slide.getElementsByTagName('li');
for (var i = 1; i < items.length; i++) {
items[i].style.display = 'none';
}

document.addEventListener('keypress', wikipedia_presentation.keypress, false);
},

stop: function() {
var body = document.getElementsByTagName('body')[0];
body.innerHTML = wikipedia_presentation.orig_markup;
body.style.textAlign = 'left';
wikipedia_presentation.setup();
document.removeEventListener('keypress', wikipedia_presentation.keypress, false);
},

keypress: function(event) {
if (event.keyCode == 39) {
wikipedia_presentation.next();
} else if (event.keyCode == 37) {
wikipedia_presentation.prev();
}
},

prev: function() {
this.pos--;
if (this.pos == -1) {
this.pos = this.sections.length - 1;
}
var slide = document.getElementById('wikipedia_presentation');
slide.innerHTML = wikipedia_presentation.sections[this.pos];
},

next: function() {

var slide = document.getElementById('wikipedia_presentation');
var items = slide.getElementsByTagName('li');

var hidden = 0;
for (var i = 0; i < items.length; i++) {
if (items[i].style.display == 'none') {
hidden++;
}
}

if (hidden > 0) {
items[items.length - hidden].style.display = 'list-item';
return;
}

this.pos++;
if (this.pos == this.sections.length) {
this.pos = 0;
}
slide.innerHTML = wikipedia_presentation.sections[this.pos];
var items = slide.getElementsByTagName('li');
for (var i = 1; i < items.length; i++) {
items[i].style.display = 'none';
}

}
};

wikipedia_presentation.setup();